Mercedes-Benz 603 Service Manual page 265

Checking and machining
1 Clean valves and carry out visual inspection.
Valves with a burnt valve head, with insufficient
valve head height (h) and with worn or scored
valve stem should be replaced.
2 Measure eccentricity on valve stem.
Replace valve if eccentricity exceeds 0.03 mm.
3 Machine valve seat.
Note operating instructions for the machining
equipment and adjustment angle (a) 45" + 15' .
4 Measure eccentricity on valve seat and
height (h) of valve head.
If eccentricity is more than 0.03 mm or the
height (h) less than mm, valve should be
replaced.
h
EXIT